JPS59132581A - Base for safety plug socket particularly for explosive atmosphere - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION It relates, in particular, to electrical outlets for use in explosive atmospheres.

As is known, a socket outlet, and more generally a connector for electrically connecting two cables if necessary, has at least two phase terminals each electrically connected to one conductor of these cables. a female member or pace having a socket for the grounding or neutral terminal outside the earthing socket and a pin each connected to the other conductor of the cable and in said socket for the desired electrical connection. Each door has a male member or grab to which it is engaged.

In explosive atmospheres, for safety reasons, it is necessary to make contact between the bottle and the socket in a suitable closed space, generally known as an explosion-proof safety room, so that the above-mentioned contact precautions are avoided. Even if a spark occurs when the current is cut off, the resulting explosion must be confined to the safety chamber mentioned above, and flame propagation outside it must be prevented.

To date, the safety chamber described above has become common throughout all sockets of Pace.

The #@glaze devices that have been proposed so far mechanically fix the bladder to the pace.

In the known i/devices, a bioit type extension is provided between the grab and the pace, and in many cases a switch is provided inside these, for example inside the dividing chamber, and this switch is connected to a socket. The bladder is placed upstream of the socket so that 1 pressure is not applied synchronously, and the bladder is removed before 1" pressure is applied to the socket, and conversely, insertion is prevented when heavy pressure is applied to the socket.

In another variant, which is only permitted by regulation for socket-outlets for w-rated currents below 2SθvJ + IlθA, instead of using the switch described above, a mask may be provided in the grab bin to prevent direct access to the pace socket. It is being

When engaging this bladder, the pace can be mechanically tightened by turning the bladder against the pace, closing the switch in the first case, and approaching the pace and the glove in the second case i. It is now possible to remotely control masks that regulate the use of masks.

In the known device of Hori 2, a key is provided between the glove and the pace to control mechanical tightening of the plug on the pace, and when this key is used to activate a switch in a small chamber separated from the pace, At the same time, the upstream of the socket is traced 1° and cut off.

In practice, these devices are fairly initial to manufacture, mechanical tightening requires switches and masks to be associated with the device, and is therefore large and costly.

The object of the present invention is generally to eliminate these drawbacks and to automatically release the pace socket from incubation pressure upon separation of the plug without the use of switches or masks and without the use of mechanical tightening devices. The goal is to provide a device that can do this.

More precisely, a pace for a safety outlet according to the invention,
Particularly for explosive atmosphere safety outlets, in which at least two phase terminal or neutral terminal sockets outside the earthing socket are adapted to engage the pins of the outlet's grab and within a body made of insulating material. characterized in that it has explosion-proof safety chambers at least as many times as the number of phase terminals or neutral terminals, and sockets for the phase terminals or neutral terminals are separately arranged in the explosion-proof safety chambers. There is.

It is also possible to actuate the individual pin-socket combinations individually.

In fact, in the present invention, a single explosion-proof safety chamber corresponding to the above-mentioned pin-socket combination is provided with a contact member supported at the bottom of the safety chamber and a contact piston movable in the axial direction within the safety chamber. The contact piston divides the safety chamber into two, and a socket is provided on the front opening side of the safety chamber.

The contact member formed in the explosion-proof safety chamber is itself a pin (hereinafter referred to as a pace pin to distinguish it from the pin of a glove), and this penis pin supports it and connects it to the explosion-proof safety chamber. A socket is provided on the bottom side of the contact piston and protrudes in the axial direction from the bottom, through which the pace pin is engaged.

In the modified example, the contact members are w: gauze pieces, which protrude axially from the bottom of the explosion-proof safety chamber, and the corresponding contact pistons are moved axially away from each other by telescopic pistons, i.e. elastic separation means. It consists of at least two movably mounted piston elements, which are biased in opposite axial directions by the elastic separation means, the forward piston element being provided with a corresponding socket and the rear piston element being biased in opposite axial directions. The piston element is adapted to engage the contact piece by a simple engagement.

In any case, the stroke of the contact piston in the explosion-proof safety room is as follows at the end of the forward stroke on the opening side of the safety room:
The length should be long enough to break all contact with the contact member.

Additionally, when retracting the f2 da relative to the pace, the pin in the grab pulls the contact piston out with it, causing the pin to move with its socket, and before the pin disengages from the contact piston, the contact The contact piston is disengaged from the member.

In other words, the retraction of the pace karanokhin according to the present invention results in a double disconnection, that is, the disconnection between the contact piston and the contact member located in the explosion-proof safety chamber opposite the Z, and the disconnection of the socket of the plug with respect to the contact piston. There are 6 things to do.

Therefore, the necessary safety state can be ensured very easily.

Furthermore, under the same conditions, the 7'' pace itself can be simplified and its dimensions can be made smaller.

Furthermore, without special equipment such as bayonet or locks, the grab pin can be a simple pin made in accordance with the law for normal installation, and in terms of compatibility required by government standards for materials. Are better.

The features and advantages of the invention are described below using the accompanying conceptual drawings! This will become clear from the first demonstration.

As shown, the safety outlet according to the invention includes a conventional female member or pace 10 and a male member or grab 11.

In the illustrated embodiment, the base 10 is supported by a case 12, which is a so-called "enhanced safety case", and is attached to an arbitrary object via this case 12.

This 12-eye case is well known and does not constitute a part of the present invention, so its details will be omitted here.

Here, a shaft (cylindrical body) 1B is provided for the attachment of the pace lO-, and the pace JO is integrated with [14 of this shaft 18 in an unreasonable manner and is formed on the shoulder formed in the transverse direction. *l+ that it is in contact with the bottom 14 through the portion 15 or the collar 157;
A center hole 16 is formed in the shaft 18, an annular space is provided between the pace and the side wall of the shaft 18 for inserting the skirt portion 18 of the first ladder 11, and the bottom of the shaft 18 A sealing cap 19 is disposed on the outside of the shaft 18 to which the tip of the skirt portion 8 of the glove 11 comes into contact, and also seals the case when the glove 11 is not inserted. Suffice it to say that the cover 20 is pivotally mounted.

In fact, in the case of the embodiment shown, the cover 20 is biased by a spring 71 towards the closed position of the cover 20 and rests on the open end of the shaft 18, as is known in the art. A sealing/matting 79 is annularly retained in the groove 77 for stability.

1, in the embodiment shown, the shaft 18, as is known.
A vertical groove 21 constituting a positioning pin is formed in a part of the side wall of the glove 11, and a bead 2B that forms a pair with this vertical groove extends at least a portion from the edge of the skirt portion 18 of the glove 11. It is formed over a wide area.

Although the grab 11 is only partially shown in Figure 5C, it does not form part of the present invention and is well known to those skilled in the art.
Details are omitted here.

Here, it is noted that the flange 28 which rests on a part of the shirt 1B of the skirt 12 projects laterally from the outside of the skirt 18, and that there is a part of the bottom part of the skirt 18 inside the skirt 18, which is not visible in the figure. Suffice it to say that there are at least two phase or neutral pins 26 mounted outside the ground pin 25.

In fact, in the illustrated embodiment, two pins 26 are shown for the sake of simplicity; in this case, as phase pins, this outlet is assumed to be associated with a single phase.

As is known, the pace lO comprises a body made of an insulating material and has a socket 28 for a ground terminal piece which is to be combined with the pin of the grab 11 and sockets 29 for at least two phase terminals or neutral terminals. It is provided.

As before, the figure only shows three sockets for phase terminals.

According to the invention, a socket 29 for a phase terminal or a neutral terminal is provided.
At least the same number of explosion-proof safety chambers 8 are provided, and one socket 29 for a phase terminal or a neutral terminal is provided in each explosion-proof safety chamber Bo.

In practice, in the illustrated embodiment, the number of explosion-proof safety chambers 80 is made to match the number of sockets 29 for the phase or neutral terminals, and the sockets 28 for the earth terminals have a separate An explosion-proof safety room is provided.

That is, the socket 28 for this ground terminal piece generally does not need to be constructed in an explosion-proof safe room as described above.

However, in the present invention, the socket 28 for the grounding piece is the same # as the socket 29 for the phase terminal or neutral terminal. It should be understood that there is nothing that should not be done.

Inside the PACE IO, that is, at the rear, each explosion-proof safety chamber 80 is sealed with a bushing 68 made of an insulating material in the special case F11 shown in Figures 1 to 7 and in the embodiment shown in Figure 9. , this bushing 68 forms the bottom 82 of the explosion-proof safety chamber 80 .

Inside the explosion-proof safety room 8 () ■Spit on the bush 68 above! The linear fitting length is determined in accordance with the leak line, and this length is made long enough to satisfy the requirements of the material from which it is made.

In the embodiments shown in FIGS. 1 to 7 and 9, the entire bushing 68 made as described above is integrated with the character f.
It is covered from the outside by f14, and the character is 7'6
4 is a common one, and the phase terminal t4 has on its outside the same number of sockets 66 as the neutral terminal soakerats 29, and each of these sockets has a contact member 67.
is accommodated.

A contact member 67 corresponding to each socket 66 is combined with a fitting 68 for connection to an arbitrary conductor (not shown), and the conductor can be fixed to the contact member 67 by tightening a screw 69. It has become.

On the outside 11jl of the pace 10, that is, on the previous issue, a collar 84 is formed in each explosion-proof safety chamber 8 () and projects sideways into the explosion-proof safety chamber, and the opening 8 of this collar 84
5 constitutes an opening to the mouth of the explosion-proof safety chamber.

The diameter of this opening 85 corresponds to the diameter of the pin 26 of the grab 11, which means 3! ! ! I can shoot it.

It will also be understood that the length L' of the collar 84 in the -11 direction, which eliminates the leak line, is at least the same as, for example, the same as, the axial length L', in accordance with the material specifications.

The safety room 30 constitutes an explosion-proof safety room because it has the above-described structure.

In the bulletproof safety chamber 80 having the above configuration, in the case of the present invention, a contact member is disposed on the bottom 82 of the explosion-proof safety chamber 30, and a contact piston is movable in the axial direction within the explosion-proof safety chamber. 40 are arranged.

This contact piston 40 is divided into two parts, and the opening 8 of the explosion-proof safety chamber 8° is located in front of it.
A socket 29 for a phase terminal or a neutral terminal is provided on the 5 side.

In the special embodiment shown in FIG. 3, the contact member provided on the bottom 82 of the explosion-proof safety chamber 80 is a pin 87 (hereinafter referred to as a pace pin for convenience).

In fact, the pace pin 87 projects axially onto the bottom 82 of the bulletproof safety chamber 8o in which it is mounted and passes through the corresponding bushing 68. It is preferable that the axial length L" of the axial through hole 48 of this bushing is at least the same as the aforementioned axial length for the reasons described above and N1, and the pace bin 8 is accommodated by this through hole 48. It is integrated with the contact member 67.

Similarly, in order to cooperate with the corresponding pace bin 87, in the embodiment shown in FIGS. The piston 4o is provided with a socket 47 or a rear socket I) through which the contact piston is connected to the pace pin 87.

In reality, the contact piston 4o is made of gold ring, and therefore,
1st. In the embodiment shown in FIG. Or the socket 29 for the neutral terminal (which faces towards the opening 85 of the explosion-proof safety chamber) and the socket 4 towards its bottom 82? It has

Also, in this implementation, at least one socket 29, 4? of each contact piston 4o is provided. has a lateral shoulder 70 for regulating engagement with a corresponding lug or pace pin at a distance from the bottom thereof, and preferably shoulders 70 on both sockets as shown. 7o
is formed.

In fact, as is well known, each socket 27°47 has a circumferential dividing slit 5o which provides a certain radial elasticity and elastically holds the pin 2f1.87 when it engages with it. It is formed.

In order to carry out the above-mentioned holding, each socket 29',
47 is preferably radially prestressed with respect to the corresponding bin 26.87.

For example, as is known, the above-mentioned prestress can be provided by the action of a break-proof cylinder 51, which constitutes a spring surrounding the outside of each socket 29,47.

In fact, in the illustrated embodiment, the sockets 29.47 have substantially the same axial length and the same construction.

Furthermore, in reality, the stroke of the contact piston +0 within the explosion-proof safety chamber 8 ( ) is at the end of the forward stroke toward the opening 85 side of the explosion-proof safety chamber 80 as shown in FIG. The corresponding contact member is long enough to completely break out of contact with the pass pin 87.

That is, it is preferable that the distance D' from the pace bottle, which corresponds to the distance in the air after being pulled out, is set to a value sufficient to satisfy the specifications of the constituent materials.

Also, as shown, in the embodiment of Figures 1-3, it is preferred to include a releasable ratchet means on the contact piston for fixing its position at the end of its forward stroke.

In the embodiment shown in FIG. 1, the above-mentioned releasable ratchet means is provided by a resilient ring 58, e.g. Open elastic ring 58
and an annular corresponding groove 55 formed on the inner wall of the explosion-proof safety chamber 80 so as to be engaged with the elastic ring 58.
It is made up of.

The axial side between each side of the groove 54 of the contact piston 40 and the corresponding free surface of the intermediate valve seat 48 of the contact piston is preferably at least half of said axial distance. As can be seen from the figure, by providing the above-mentioned double-touch means, the contact piston 40 contacts the collar 84 constituting the opening 85 of the corresponding explosion-proof safety chamber 80 at the end of its forward stroke. It does not stop at a distance from the inner surface 89 of this collar 84.

In the embodiment shown in FIGS. 1-7 and 9, each contact piston 40 has an explosion-proof safety chamber 8 movably accommodating the contact piston in the direction of the end position of the forward stroke.
An elastic return means is provided which is constantly biased in the direction of the opening 85 at 0.

Actually, in the illustrated embodiment, the elastic return means is constituted by a coil spring type metal spring 60, and this spring 60
applies force to the contact piston 40 associated therewith via a spacer 61 made of insulating material.

In the illustrated embodiment, the spacer 61 forms a sleeve, which sleeve is supported on the intermediate valve seat 48 of the contact piston 40 and the socket 4 of the contact piston. and actually extends beyond the free end of the rear socket 47 as shown.

Mata, the spring 6 resting in a ring around the pace bin 87
0 rests on the bushing 6B forming the bottom 82 of the corresponding explosion-proof safety chamber 80.

Roughly speaking, in the embodiment shown in FIG. 1, a metal fitting 78 on the outside of the cover 20 is pivoted to the gauge 12 of the pace lO, and this metal fitting 78 is connected to the cover 2 through a notch 75.
0 in the closed position and is redirected by a spring 76 to the corresponding position.

In the present invention, a notch 80 of m2 is formed in front of the notch 75 of the metal fitting 78, and when one lug 11 is inserted through this notch 80 as described below, at least It is designed to temporarily hold Terrada in an intermediate position.

Actually, as shown in the figure, the notch 80 is formed in the long portion 82 of the metal fitting 78, and the engaging piece inclined surface 88 is provided at the tip thereof.

In the illustrated embodiment, the cover 20 and the hook are arranged at both ends in the diametrical direction relative to the shirt 1B, and the hook engages with the notch 75 of the metal fitting 7B. A bin 85 is formed on the cover 20 and protrudes from the outer periphery to the outside in the radial direction.

Similarly, the skirt 18 of the Prada 11 has a radius from the flange 28 which is usually provided in order to abut it against the opening of the shaft 18 of the Pace 10 so as to engage the notch 80 of the fitting 78. ] A protruding bottle 87 is formed at i31.

In the standby position, the cover 20 is closed, the contact piston 40 is in the final position of its forward stroke, and the ratchet of the elastic ring 58 supported by the rear door piston 40) if3
The nine spears are accommodated in the grooves 55 of the corresponding explosion-proof safety chambers 80, as shown in Figures 1 and 3.5A.

Therefore, a voltage is applied to the desk piston, but it is impossible to approach the pace bin 87 to which a voltage corresponding to the voltage is applied.

Insertion or attachment of Prada 11 occurs in two stages.

In the first stage, first pull the metal fitting 78 slightly and cover 2.
0, and the prada 11 is arranged perpendicularly to the shaft 18 (Fig. 1), and the skirt part 18 first engages with the engagement slope 88 of the metal fitting 8 (Fig. 5A), and then the flange 28 is opened. After temporarily releasing the metal fitting 78, the skirt portion 18 is engaged into the shirt 1B, and the bottle 26 is inserted into the socket 29 for the phase terminal or neutral terminal of the subsequent piston 40. The grounding pin 25 is inserted into the grounding socket 28 by inserting it (FIG. 5B) into abutment against the lateral shoulder 70 of the socket.

Due to the ratcheting action at the end of the forward stroke by the elastic ring 58 attached to the contact piston and the biasing force of the spring 60, even if a pulling force is applied due to friction when the pin 26 of the Prada 11 is inserted, the contact piston will not move. 40 is temporarily stopped at the end point W of its forward stroke.

That is, the force opposing the engagement of the front socket 29 of the contact piston 40 with the f2 pin 26 due to its radial prestress is necessary to disengage the ratchet means constituted by the elastic ring 58 carried by the contact piston. The force in the axial direction is smaller than the sum of the axial force required to overcome the action of the spring 60. That is, the front socket 29 is the first to elastically deform during insertion.

Therefore, the coupling of the pin z6 of the Prada 11 with the contact piston 40 of the invention takes place at a time when there is no voltage on the contact piston.

At the trunk stage, 1 love 11 is the shaft 18 of pace lO
After being engaged therein, the corresponding shoulder 70 of the contact piston 40
The contact piston is pulled in the direction of the pace pin 87 by the pin 26 in contact with the upper part, the elastic ring 58 is elastically deformed and its shape becomes smaller until it contacts the inner wall of the explosion-proof safety chamber 80, and the contact piston 40 is pushed. Engage the rear socket 47 with the 1st ladder bin z6 (Fig. 5C)
.

At the same time, the spring 6 combined with this contact piston 40
0 is pressed.

Contact piston 40 is thus connected to pin 26 of Prada 11 and pace pin 87, and electrical contact between pin 26 and pin 87 is achieved.

As is normally done, the protrusion 90 formed on the side surface of the Prada 11 and the protrusion 91 of the cover 2 [) are engaged with each other, and the Prada 11 is locked in the engaged position.

Removal of the Prada 11, ie, retraction, is also performed in two stages.

In the first stage, a pulling force is applied to the f-ladder 11. This pulling operation is performed by the protrusion 8 of the flange 28 of the skirt 18.
7 is regulated by coming into contact with a notch 80 of the metal fitting 78, as shown in FIG.

However, due to the pulling force of the pin 26 of the lug 11 and the axial return force of the spring 60, the imaginary piston 40
moves in the direction of the backward movement of Prada 11 together with 12g]l.

That is, the axial return force of the spring 60 is larger than the axial frictional force when the elastic ring 58 attached to each contact piston 40 moves on the inner wall of the explosion-proof safety chamber 80 according to the present invention. It is preferable to have a structure that

Anti-break ring 5 tightening socket 29.47
The radial prestress applied to the socket 70) 29.47 of the contact piston by 1 is preferably the same for each of both sockets 29.47, so that the anti-cracking 1
It is preferable that the "rings 51" be the same.

In reality, the contact piston 40 itself is at the end of its forward stroke at the intermediate position of the plug 11 where it engages with the notch 80 of the metal fitting 78, and the elastic ring 58 supported thereon returns to the explosion-proof safety chamber. 80 to return to the initial unfolded shape.

1 Lug 11 above representing the first stage of unplugging
At the intermediate position, the contact piston 40 is separated from the base bin 87, and no voltage is applied to the contact piston 40. Similarly, no voltage is applied to the pin 26 of the plug 11.

If desired, it is also possible to leave the plug 11 attached to the pace 10 with the plug 11 electrically disconnected from the pace 10, thereby allowing the
Problems that always arise when the rudder 11 is not in use can be addressed in an extremely simple manner to keep it in good maintenance condition. This point is especially true in the case of temporary disuse.

In the third stage, if necessary, the latch can be released from the metal fitting 78 to allow the plug 11 to be further pulled out.

The pin 26 thereby separates from the contact piston 40.

The contact piston 4 (1 remains at the end position of its forward stroke, which has already come.

However, according to the present invention, the above-mentioned interruption can be performed when no voltage is already applied to the contact piston 40.

=Of course, the cover 20 is closed again by the force of the spring 71, and the protruding bottle 85 is hooked by the metal fitting? 8, the cover 20 is held in the closed position.

In any case, when removing the plug 11 completely,
In the hook of the present invention, this extraction operation is divided into two stages by the metal fitting 78, and when the plug 11 comes from the engagement position to the intermediate position, the electricity is already cut off as described above, and then it is completely extracted. It looks like this.

By dividing the extraction into two stages in this way, even if the outlet is pulled out very quickly, especially if the outlet is extremely self-inductive, the sparks that will inevitably be caused by the interruption will be released outside and can be dangerous. situation can be prevented.

In all cases, the return spring 6 combined with the afterbirth contact
0 and the resilient ring 58 fixing the end of its forward stroke, the contact piston 40 always remains unenergized unless the plug 11 is present.

Therefore, the plug bin 26 and the contact 40 are reliably engaged without contacting the pace bin 87 and when no voltage is applied.

Moreover, when the plug 11 is secured to the base lO, even if the plug 11 is pulled out early before this engagement reaches the normal state, malfunction is completely impossible.

That is, in this case, the contact piston 40 is pulled out to the end position of the forward stroke by the Gradavi/26 with which the contact piston is necessarily engaged, and does not stay in the middle position, but contacts the base bin 87i. There is no risk of voltage being applied.

In addition, as shown in the examples shown in Figures 1 to 9 and Figure 9, the engagement stroke with the pins 26 and 37 is controlled by the inner shoulder portion 7 () provided on each socket 29.47 of the contact piston 4o. It can minimize the elasticity of the socket and give it 4
The socket 29.47 can be made to any length necessary to accommodate the length.

As shown in Figure 6.7, a positioning device can be provided to prevent the insertion of a plug 11 that does not meet the desired safety standards.

In this case, a radially protruding lip 92 is provided from the flap 84 of the grounding socket 28, and a groove corresponding to the lip 92 is provided in the grounding bin 25 of the plug 11.

In the modification shown in FIG. g, the spring that urges the contact piston 4o toward the end of the forward stroke is not fanned.

However, by carefully selecting the percentage characteristics of each component, the radial prestress of the front socket 29 of the contact piston 46 can be made larger than the radial prestress of the rear socket for each bin 2f1.87. can do.

Similarly, the axial force generated by tightening the bladder pin 26 by the front socket 29 of the contact piston 40 due to the radial prestress is transferred to the base pin 26 through its socket 47 due to the radial prestress in the other socket 47. The axial force generated by tightening 87;
The elastic ring 58 attached to the contact piston 40 is made thicker than the sum of the axial force generated by friction when it moves on the inner wall of the explosion-proof safety chamber 80.

Therefore, when pulling out one ladder 11 while the grab 11 is in alignment with this pace lO, first pull out the contact piston 40 housed in the pace lO with the bin 26 at the first stage as in the previous case. Then, in a second step, the pin 26 is removed from the contact piston 40.

In the illustrated embodiment, each contact piston 40 rests against an inner surface 89 of a collar 84 forming an opening 85 of an explosion-proof safety chamber 80 .

However, as in the previous embodiment, it can also be moved a little further forward than that, so that the end point of the forward stroke is at the elastic ring 5.
8 can be defined when engaged with the groove 55 of the explosion-proof safety chamber 80.

Conversely, when inserting the tip 11 into the pace 10, in the first step, the pin 26 of the glove 11 is inserted into the front socket 29 of the contact piston 40, as in the previous embodiment. At this time, the contact piston 40 does not move.

1, that is, in this case, the axial force of the front socket 29 of the contact piston 40 against its engagement with the grab pin 26 due to the radial prestress will release the ratchet means associated with this contact piston 40. The required axial force is smaller.

Therefore, the front socket 29
First, do your hair.

In the second stage, the pin 26iJjj of the socket 11, in the case of the illustrated embodiment, the front socket' of the contact piston 4-0.
After reaching the bottom of 29 and engagement of this grab 11 with pace 10, the axial force necessary to release the releasable ratchet means associated with this contact piston 40 is overcome. , the contact piston 40 is pushed in by the grab 11.

With this pushing, the contact piston 4o is inserted into the rear socket 4.
7 engages pacebin 87.

Also, in this embodiment, the end position of the rearward stroke of the contact piston 4o is defined by the bottom 82 of the explosion-proof safety chamber 80 in which it is movably housed: In fact, in this embodiment, the bushing 68 is that character f
64, and it is necessary to insert the extension part 42 of the base bin 87 into this catch 64.
is directly formed, and the bin 87 is placed in an explosion-proof safety room 8o.
It is surrounded by an annular abutment part 88 that fits into a part of the . This extension 42 is hollow so as to be tightened onto the conductor core of the conductor.

In the embodiment shown in FIG. 9, the contact member is an explosion-proof safety chamber 80.
A bottle 97 is provided on each bottom 82 of the bottle 97.
The contact pistons 4o according to the present invention movably housed in the explosion-proof safety chamber ao are extendable from the bottom 82 in the same manner as in the embodiment described above. This piston is composed of 98.99 piston elements.

In fact, in this embodiment there are two piston elements 98.
99 are provided and biased in opposite axial directions by an elastic separation means formed by a spring 100.

A piston element 98 distributed on the front side of the opening 85 (1) of the explosion-proof safety chamber 80 carries a phase terminal or neutral terminal piece socket 29, which socket 29 is identical to the previous embodiment and is fitted with a socket 11. 5oI! : It has a split 7 and a 1j ring 51. Also, the piston element 99 arranged on the side 1 opposite to the rear opening 985 is adapted to engage with the pin 07 by a constant abutment.

In the illustrated embodiment, a hole 1i is provided at the rear of the piston element 98.
) 2 is of the shape If the piston is inside this hole 1 () 2''
Element 99 is engaged and has a lateral bulge 10B formed in its opening.

The piston element 99 has a hole 104 formed in it, through which the piston element 99 engages with the hole 102 of the piston element 98, and its f! il
The wall is divided in the circumferential direction by a slit 1.05, on the outside of which a transverse extension 106 is formed which projects in the direction opposite to the axis, and this extension tree (106 abuts the extension 108 of the piston element 98). It is designed to be in contact with each other.

A spring l (1) is placed in the space defined by the two holes 102, 104 and supported at the bottom of each of them.

A contact piece 108 for engaging with the pin 97 is supported on the outside of the piston element 99, and a second contact piece 109 for engaging with this is supported by the pin 97.

These contact pieces] 08 and 109 are preferably made of a highly conductive metal or alloy.

In the illustrated embodiment, bin 97 is replaced by bin 87 of the previous embodiment.
and the length outside the point board are very similar.

However, as a modification, it is only possible to make the contact piece 109 a certain length until it sufficiently protrudes from the bottom 82 of the explosion-proof safety chamber 80.

In other respects the embodiment shown in FIG. 9 is of the same type as that shown in ship FIG.
0, the spacer 61 is the same.

The simple abutting contact that occurs between the contact piston 40 and the pin 97 in this embodiment eliminates the mating that occurs between the two parts at high currents and/or voltages, which This is favorable for the shutoff capability of the assembly.

It will be understood that the invention is not limited to the embodiments described and illustrated above, but includes various modifications and/or combinations of elements.

In particular, if a contact piston with two sockets is to be subjected to different radial prestresses, the diameter of the base pin can be made slightly smaller than the diameter of the grab pin m.

The fitting can use a symmetrical contact piston, which facilitates fabrication and installation.

In addition, the shaft in which the cylinder having the socket for the phase terminal or neutral terminal of the pace is housed is formed as a single member separately from the case of the pace, and this member is attached to the case with, for example, screws, and the shaft is attached to the case from the cylinder. It is also possible to provide a clamping flange with a radially projecting projection, which gives the cylinder a defined angular position around the axis as a function of the desired working voltage, and other identification means. It is also possible to maintain the axial direction without using it.

Further, the field of application of the present invention is not limited to only those using two-phase sockets in the case of single-phase wiring.

The invention can also be used for three-phase wiring, in which case three phase sockets can be provided, together with a socket for the neutral terminal in addition to the earth socket.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the base for a safety outlet according to the present invention taken along line I-, 1 in FIG. 2; Figure 2 shows the above-mentioned pace portion (l
Li 1 view. Fig. 3 is a detailed enlarged view of the part m in Fig. 7. Figure 9 is a detailed enlarged view of the part marked ■ in Figure 3. Figures 5A, 5B, and 5C are similar to Figure 1 but have different magnifications, and show each step in using the safety outlet strip of the present invention. FIG. 6 is a partial cross-sectional view of another embodiment of the base for a safety outlet taken along the line ■-■ in FIG. 71, and the magnification is different. Figure 7 is a cross-sectional view taken along the line ■-■ in Figure 6. Fig. 59 is a detailed view similar to Fig. 8g3, each showing another embodiment of the safety outlet base of the present invention. 10... pace, 11... glove, 12... case, 18... shaft, 14... bottom, 15 river delivery f
#, 18...5 Skirt fl, 19...Patchkin, 20...Cover, 28...Flange, 2.5.
... Earth bin, 26 ... Bladder pin, 28 ... Ground socket, z9 ... Phase terminal piece socket, 8 (
)...Explosion-proof safety chamber, 40...Contact piston. FIG, 8 FIG, 9 -45) 1

Claims (1)

[Claims] (11. Ground terminal socket 2 used as needed)
8 and at least two phase or neutral terminal sockets 29 for engagement with the pins 26 of the Concend Grada II. At least the same number of explosion-proof safety chambers 80 as phase terminal or neutral terminal sockets 29 are provided, and each of the phase terminal or neutral terminal sockets 29 is housed separately in the explosion-proof safety chamber 80. (21) A contact member 87.9 is arranged at the bottom 82 of the explosion-proof safety chamber 80, and a contact member 87.9? A contact piston 40 is disposed in a movable manner, and this contact piston 40 divides the explosion-proof safety chamber into two parts and opens at the front opening 85 of this safety chamber.
(3) Explosion-proof type in which the contact piston 40 is housed in a movable state. When the stroke of the contact piston 40 in the safety chamber 80 reaches the end point of its forward stroke on the opening 85 side of the explosion-proof safety chamber, the contact piston completely separates from the contact members 87, 9 with which it is combined. (4) The contact member 87.9? is an explosion-proof safety chamber 80.
A pin 87, hereinafter referred to as a pace pin, protrudes in the axial direction from the &82 of pace pin 8
Claim 4, characterized in that it is adapted to engage with 7.121. +Pace listed in any one of paragraph 31. (5) The contact members 87 and 97 are connected to the bottom 82 of the explosion-proof safety chamber 80.
The pin 97 projects axially from the contact piston 40 and the contact piston 40 is movable in the axial direction with respect to the telescoping piston, i.e., the elastic separation means 100.
The piston is composed of two piston elements 98 and 99, and the elastic separation means 1 (10dj) urges these piston elements in opposite directions in the axial direction, and the one in the front of the piston elements 98 has a phase terminal strip or neutral terminal strip socket 29, the rearward one 99 being adapted to engage with said pin 9 by mere abutment. (3), (4
) The pace described in any one of the sections. (6) In each explosion-proof safety chamber 80, a force is applied to the contact piston 40 by an elastic return means 60 that always urges it forward. (4), (5) The pace described in any one of the above. (7) Elastic return means 6- combined with contact piston 40
0 is composed of a full-range coil spring, and this gold ring spring is in contact with the bottom 82 of the explosion-proof safety chamber 80 and applies force to the contact piston 40 via a spacer 61 made of an insulating material. Featured Claim 11V
(The pace described in item 61. (8) The spacer 61 interposed between the contact piston ΦO and the spring constituting the elastic return means 60 is 1)
- forming a sleeve, which sleeve is supported on the intermediate valve seat 48 of the contact piston and extends annularly around the rear socket 47;
(9) The pace according to claim (8), characterized in that the sleeve extends beyond the rear socket 47 of the contact piston 40. 0Q At a distance of -51F from the bottom of the socket 29 for the phase or neutral terminal mounted on the imaginary piston 40, a lateral shoulder 70 for limiting the engagement of the plug 11 with the corresponding pin 26 is located thereon. The pace according to any one of claims 21 to 91, characterized in that the contact point is formed inside the rear socket 47 attached to the piston 40. Lateral mgi?0 to limit the engagement of one lug 11 with the corresponding bin 26 at a certain distance from the bottom.
Claims characterized in that: (
3) The pace described in the gong. Claims (2) to 01 are characterized in that releasable ratchet means for fixing the position 89 of the 02 imaginary piston 40 at the end of its forward stroke are engaged with the subsequent piston 40. ) The pace described in any one of the sections. a further annular waterfall 5 in which said releasable ratchet means is formed on the outer periphery of the contact piston 40 in its intermediate region;
4 and an elastic ring 58 locked within the elastic ring 5.
A pace according to claims oz, rI:I, characterized in that the annular vortex 55 is formed in correspondence with the inner wall of the explosion-proof safety chamber 80 so as to engage with the annular vortex 55. α4 Contact piston socket) 29.47 is elastically given a radial prestress to the corresponding bottle by the action of a crack prevention ring 51 forming a spring, and a radial prestress of the front socket 20 is larger than the radial prestress of the rear socket 47.
l! A pace manufactured by the scope of claim (4). 00 The axial force due to the internal determination of the plug bin 26 by the front socket 29 of the contact piston 40 due to the action of radial prestress is the bA1 of the pace bin 37 due to the rear socket Φ7 of the contact piston 40 due to the action of radial prestress.
be larger than the sum of the axial force caused by the friction and the axial force caused by the friction when the elastic ring 53 attached to the rear door piston 40 slides on the inner wall of the Jl)i 9 type safety chamber 30. A pace as claimed in side 3 of the claims, paragraph aa. +181 The radial prestress of the forward socket 29 of the post-piston +0 counteracts the retention of the plug pin 26; the force in the axial direction required to release the releasable ratchet means engaged with the contact piston Φ0 Claim No. 03% (14
The pace described in section 1. aη the axial tightening force necessary for the axial force opposing the engagement with the grab pin 26 by the radial prestress of the front socket 29 of the contact piston 40 to release the ratchet means engaged with the contact piston 40; and the axial force necessary to overcome the force of the elastic return means 6 () similarly combined. (The pace described in item 141.
The axial return force exerted by the contact piston is larger than the axial force due to friction when the elastic ring 58 supported by the contact piston slides on the inner wall' of the corresponding explosion-proof safety chamber 30. Range No. +61, (pace described in item 121. αe Contact piston 40 front and rear sockets 2
9. A pace according to claim 4, characterized in that the prestress for radial tightening of Φ7 is the same for both sockets. A cover 20 for closing the case and a hook having a notch 75 for maintaining the cover 20 in the closed position are pivotally connected to a metal fitting 78, and the hook is attached to the metal fitting 78 in a manner that is larger than the notch. A patent claim characterized in that a navy blue notch 80 is formed in the front, and the glove is held at least temporarily in an intermediate position by this second notch when the first ladder 11 is extracted. Range number (11)
~α口珈The pace described in any one of the items. 60. A pace for a safety outlet according to claim □□□, characterized in that the hook has a fitting inclined surface 83 formed at the end of the second notch 80 of the metal fitting 7B. The pace according to any one of claims (n, Qυ), characterized in that it is attached to a "safety-enhanced" case 12.